OVERVIEW

Every innovation in Quarq’s next-generation DZero platform is channeled into DFour. It embodies 10 years of Quarq technology advances with new features such as dual Bluetooth low energy and ANT+ wireless data transfer, the new Qalvin BLE app and compatibility with BB386EVO bottom brackets.

Designed for Dura-Ace 9000 chainrings. Compatible with Ultegra 6800 and 105 5800 chainrings.Must be paired with a compatible SRAM bottom bracket.ELSA RS power meter owners can upgrade using the DFour Power Meter Spider.Free firmware upgrades with the Qalvin app.BB30 versions ship with the spacers and wave washer required for BB386EVO installation.